STC means Seem Transmission Course which rating will show you particularly just how much noise an item will absorb and/or mirror. Seek out it on the internet or on item labels when you store. For residences with sash windows (fashioned of moveable panels that slide around one another to open https://mylesbxner.jaiblogs.com/53689029/the-2-minute-rule-for-london-sw3-secondary-glazing-services